Wilson is 28 years old and has worked as a police officer for the past six years, Jackson said, noting that Wilson has been working in Ferguson for four years and spent two years in a different part of Missouri. ABC News' calls to the first police department where he reportedly worked were not immediately returned.

Wilson does not have any prior disciplinary complaints, Jackson said.

Brown's shooting death on Aug. 9 has been "devastating" to Wilson, Jackson said.